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Commit d56e03cd authored by David Howells's avatar David Howells Committed by Linus Torvalds
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[PATCH] NOMMU: supply get_unmapped_area() to fix NOMMU SYSV SHM 



Supply a get_unmapped_area() to fix NOMMU SYSV SHM support.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarAdam Litke <agl@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8da38d7b

mm/nommu.c

+22 −0
Original line number Diff line number Diff line
@@ -1192,6 +1192,28 @@ void unmap_mapping_range(struct address_space *mapping, 
}

EXPORT_SYMBOL(unmap_mapping_range);



/*

 * ask for an unmapped area at which to create a mapping on a file

 */

unsigned long get_unmapped_area(struct file *file, unsigned long addr,

				unsigned long len, unsigned long pgoff,

				unsigned long flags)

{

	unsigned long (*get_area)(struct file *, unsigned long, unsigned long,

				  unsigned long, unsigned long);



	get_area = current->mm->get_unmapped_area;

	if (file && file->f_op && file->f_op->get_unmapped_area)

		get_area = file->f_op->get_unmapped_area;



	if (!get_area)

		return -ENOSYS;



	return get_area(file, addr, len, pgoff, flags);

}



EXPORT_SYMBOL(get_unmapped_area);



/*

 * Check that a process has enough memory to allocate a new virtual

 * mapping. 0 means there is enough memory for the allocation to